How long will Toyota Prius batterys last?

Answer 1

It depends. A mechanic friend of mine said anywhere from 70,000 to 90,000 miles. The down side is they cost ~ $9,000 each (total of $18,000) to replace.

In California and New York they are warrantied for 10 years or 100,000 miles. In most of the rest of the country they are only warrantied for 8 years or 80,000 miles. Therefore I conclude that Toyota is very confident that 90% should last 8 years or 80,000 miles.